Improvement in the mode of converting reciprocal into rotary motion



UNITED STATES PATENT OFFICE.

DUNCAN MORRISON, OF PORTLAND, MAINE.

IMPROVEMENT IN THE MODE OF CONVERTING RECIPROCAL INTO ROTARY MOTION.

Specification forming part of Letters Patent N0. 73,631, dated January 21, 188.

To all whom it may concern:

Be it known that I, DUNCAN MORRISON, of Portland, in the county of Cumberland and State of Maine, have invented a new and useful Improvement in Converting Reciprocal Motion into Rotary; and Ihereby declare the following to be a full, clear, and exact description thereof, which will enable others to make and use my invention, reference being had to the accompanying drawings, forming part ot' this specification, in which- Figure lis a side elevation of my invention, showing the ratchet c and pawls c d, together with the arms a, and wheels h 7c. Fig. 2 is a side elevation of the same, showing the opposite side from that on which the ratchets and pawls are attached.

In a certain application made by me for Letters Patent on a method of converting rotary intoreciprocal motion, which application has been granted, but the Letters Patent not issued, I described a weighted arm or lever swinging so as to move a shaft or shafts, the last thereof, by means of a crank, communieating the desired motion. As an improvement upon the said invention, and disclaiming the parts patented in the first application and common to both, I now employ a weighted arm, as inthe previous application, (seen at (1,) and swinging on the pivot or axis b. To this arm are attached the two pivotal pawls c d, one above the axis b, the other below it, as seen in the drawings. These two pawls c d workin small gears e f, rigidly attached to the shaft g. The gear e only is seen in the drawings, f being similar and placed on the same shaft. To this shaft g is also rigidly fixed the balancewheel h, communicating by a band with the pinion z', rigidly attached to the shaft j, upon which is also set the large wheel lo.

The operation is as follows: As the arm a swings the pawls c d alternately engage the gears ef-that is, as o is revolving the gear j, d is being drawn back to perform the same duty when c is drawn back. Thus a continuous revolution is imparted to the wheel h, and by the band communicated to the shaft j. The arm a may be moved by a crank or lever, as described in my previously-granted application. A continuous rotary motion can thus be communicated from j or 7a to any machine, as desired.

I do not claim the weighted arm a nor the the wheels h or lc, for these are the subject of previous grant to myself.

Upon the horizontal part of the frame I attach the standard x, havingthe slot and notches therein, as shown in Plate 2, having also the swinging catch w, connected by the pivot c. u shows a rod with a pulley, t. The object of this is, by setting the rod in any of the notches on the standard to increase the friction of the band upon the wheels by bending it down, as shown in Plate 2, in order to enable the machine to raise weights-as bales ot' goods, for instance-into theupper storiesofstorehouses, for which this machine is well adapted.

What I claim as my invention, and desire to secure by Letters Patent, is

The weighted swinging arm a, swinging on the pivot b, and the two pawls c d, one above and the other below the pivot b, and operating upon the gears e f alternately, so as to impart to the shaft g a continuous revolving motion, as described, together with the standard catch fw, rod and pulley u t, all arranged and operating for the purposes set forth.

DUNCAN MORRISON.

Witnesses WM. HENRY CLIFFORD, W. FRANK GEAREY. 

